BLACKSBURG, Va., July 20 -- Virginia Polytechnic Institute and State University issued the following news release:

A team of Virginia Tech geoscientists found a new way to look at the widespread impacts of dams on river temperatures: using Landsat thermal infrared imagery to gather data on rivers across the United States.

By using satellite imagery instead of site-specific on-the-ground measurements, researchers can draw from a much larger pool of data.

"Studying river temperatures up- and downstream of dams have been done before, but on 10 dams or less total," said George Allen, associate professor of hydrology and remote sensing in the Department of Geosciences. "We've expanded this to over 250 dams, so we're getting much more of a lar...